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The car in question is a 2005 T5 AWD . After six months in which my car made awfull sonds when shifting ( a transmissions clunk to be more precise ) now it no longer pulls with the rear wheels ....and it's a really stupid feeling . The dealer said the problems are not related but i'm doubting it .
The problem started six months ago when the dealer changed my differential on guarantee (manufacturing fault) , thats when the clunk began....and it's been that way for half a year cause Volvo Sweeden did not come up with an answer yet ( they're probably waiting for my 2 years of guarantee to end
( )
I'm really pissed cause the car was a lot of money and i've had so many troubles with it that no one here can fix , and volvo officials simply don't give a poop . If this is happening at 20k miles , what can i expect after another 20k , the car to fall apart ?!?
 

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Re: AWD ...which is no longer AWD , is FWD (passat)

Just read a few posts, dont do anything that could break your car (like full acceleration). Nah just kidding theres probably something broken let them fix it if its a new car http://********************/smile/emthup.gif
 

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Re: AWD ...which is no longer AWD , is FWD (passat)

Quote, originally posted by passat »
The problem started six months ago when the dealer changed my differential on guarantee (manufacturing fault) , thats when the clunk began....

What exactly are you referring to as the "differential"? The front differential, the angle gear, the Haldex unit, or the rear differential? Depending on what part was broken, I would have a different comment.

Tom.
 

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Re: (passat)

Good news! It would be interesting to know what went wrong with it. I assume it was not simply the electronics, but sometimes the entire unit will be swapped in order to perform a factory diagnosis.

Tom.
 

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Re: (pasat)

Maybe the same problem as with all the other AWD's..

There is a spline ring/shaft between the gearbox output and the angle gear input. This shaft could be damaged. It wears out until one of the shafts it sits on can rotatie freely..
Other problem can be the Haldex controller not allowing the haldex clutch to engage.

First problem can be checked by looking at the angle gear if it will rotate when the front wheels are turning. The angle gear is driven at all time. The Haldex unit decides if drive to the rear is needed.
 

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Re: (Johann)

I agree - check the angle gear. Nobody we know has lunched the spline ring in our cars yet, but there's a first time for everything.

Tom.
 

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update
got the problem fixed
the first time they did not change the haldex , they changed my "reductor" how they called it ;
the second time , they replaced the Haldex and the AWD is tip top again ; if only i'd get them to fix my transmission clunk...
 

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Re: (tmtalpey)

Quote, originally posted by tmtalpey »
I agree - check the angle gear. Nobody we know has lunched the spline ring in our cars yet, but there's a first time for everything.

Tom.

Tom, Can the haldex clutch system be replaced with just some kind of a center differential?
 

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Re: (warmonger)

Nope, because the power is always going to the fronts in our cars. A "center" diff would have to go inside the tranny!

You can think of the Haldex as a variable clutch on the rear PTO. As it goes to 100%, it's actually taking 50% of the torque, since the fronts always get theirs. (The Volvo lit that says the rear can get 100% is true only if the fronts have 0 traction).

A center diff will redistribute torque down to 0% at either end. This isn't possible with the Volvo FWD+PTO design. Basically, the fronts can do 100%->50%, as the rears do 0%->50%.

Tom.
 
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